All posts by Sumarsono

Linux

Easily Boot Linux ISO from HDD with grml-rescueboot

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You can boot Linux ISO directly from your HDD with grml-rescueboot utility. You don’t need a CD, DVD, or USB drive anymore. You don’t need to burn anything. And no need to formally configure anything. Just put an ISO then update your GRUB and it’s done. Actually, grml modifies your GRUB to recognize an ISO you provide and to boot it. Finally, you can have more than one ISO to boot at any time you start your computer.

Boot Linux ISO Directly from The HDD

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Linux

DocFetcher: A “Google Desktop” for Linux

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Are you looking for Google Desktop in Linux? Google never release that program for Linux. Instead, we have an alternative from DocFetcher. It is a great replacement for Google Desktop with more features such as selecting what type of file to index. We can select what folder to index, what filetype, and view strings found in every file. DocFetcher can show search result in a table so you can search for a string in all PDF you have. Here we show how to install in Ubuntu and how to use it. DocFetcher official site is https://docfetcher.sourceforge.net. Thanks to qforce for providing DocFetcher.

How To Install

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Linux

Install FreeDOS in Virtualbox on Ubuntu Linux

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After years, people doesn’t use Disk Operating System (DOS) anymore. Among many DOS systems ever available, MS-DOS was the most popular for desktop computers. But probably for some purposes such learning the basic of Windows command system, learning to install an OS with many disk series (and how to do it later on Debian), playing old DOS games, or any other learning purpose, you will need MS-DOS again. But MS-DOS was proprietary and was abandoned by Microsoft. Don’t worry, free software community has created FreeDOS as 1:1 replacement for MS-DOS. FreeDOS was licensed with GNU GPL v2 and available freely. It’s almost 100% compatible with MS-DOS internally (to help install some Windows systems) or externally (to install many MS-DOS games or programs). Now, we want to share how to install FreeDOS in Virtualbox. We use Ubuntu as host.

Obtain FreeDOS ISO Image

You should have FreeDOS image first. Download it from FreeDOS official site https://www.freedos.org/download. For example, we download fd11src.iso 40 MB.
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Linux

Install TOR Browser di Ubuntu 14.04

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“The Tor software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning your physical location, and it lets you access sites which are blocked.”

  1. Unduh Tor Browser disini
  2. Ekstrak hasil unduhan (LANG ganti dengan bahasa yang ada di nama file, misalnya: en-US) 
    tar -xvJf tor-browser-linux32-5.0.3_LANG.tar.xz
  3. Masuk ke direktori hasil ekstrak 
    cd tor-browser_LANG
  4. Jalankan Tor dengan perintah berikut ini: 
    ./start-tor-browser.desktop

Terima kasih, semoga bermanfaat.

Linux

Membuat Kustom ISO Ubuntu menggunakan PinguyBuilder

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“PinguyBuilder is a script which allows creating a customized Live CD/Live USB (remaster) of Ubuntu or Linux Mint, that can be used either as a distributable ISO or as a backup.”

Unduh PinguyBuilder disini.

Note:

  • Versi 3.x untuk Ubuntu 14.04
  • Versi 4.x untuk Ubuntu 15.04

Sumber:

[1] https://www.webupd8.org/2015/10/create-custom-ubuntu-iso-with.html

Terima kasih, semoga bermanfaat

Elektronika

Regulator Tegangan Variable LM317

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Regulator tegangan variabel merupakan rangkaian regluator yang  memiliki tegangan output dapat diubah-ubah sesuai kebutuhan. Rangkaian regulator tegangan variabel pada saat ini telah tersedia dalam bentuk chip IC regulator tegangan variabel 3 pin. Salah satu contoh regulator tegangan variabel adalah IC LM317.

IC LM317 merupakan chip IC regulator tegangan variable untuk tegangan DC positif. Untuk membuat power supply dengan tegangan output variabel dapat dibuat dengan sederhana apabila menggunakan IC regulator LM317.
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Elektronika

Gerbang NOR Serbaguna

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Bismillah,

Pada kesempatan kali ini saya akan menulis tentang gerbang NOR serbaguna. Serbaguna yang saya maksud, gerbang NOR mampu menggantikan gerbang lain.

Dalam kasus ini, saya ambil contoh sebuah persamaan POS (Product of Sum) yang harus diwujudkan menggunakan gerbang NOR. Normalnya persamaan POS dapat diwujudkan dengan IC OR, AND, NOT.

Persamaan Awal:

Persamaan NOR yang ekivalen dengan persamaan F:

Bukti tabel kebenaran bahwa persamaan F dan G adalah ekivalen:

Untai gerbang logika NOR untuk persamaan G:

Untai IC NOR (7402) untuk persamaan G:

Terbukti bahwa gerbang NOR mampu menggantikan fungsi persamaan POS.

Terima kasih, semoga bermanfaat.